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CVE-2026-99040VulnerabilityPublished Updated

Microsoft · KEYS: Fix add_key() race with keyring restriction

Affects MicrosoftSource GCVE Database

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Authoritative record:CVE-2026-99040· High

Not known to be exploited · fixed in f99399b48e3edd6851fac34cd329bab9f1f33baf : patch Microsoft soon.

Data as of 7 Nov 2026, 12:35 UTC

Severity
High

Rated by Threat Radar · CVSS not yet scored by NVD

Thin evidence

One scorer or none
Patch
Available – fixed in f99399b48e3edd6851fac34cd329bab9f1f33baf, dd3ea3fcba7c75493760cdbccd35f029597e8d5e, da0b595d8e6e2dd798f6e34e09dc51a13b888514 +5

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 23 Oct 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 7 Nov 2026.

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

ProductAffectedFixed in
LinuxLinuxAffected
  • ≥ 5ac7eace2d00eab5ae0e9fdee63e38aee6001f7c, < f99399b48e3edd6851fac34cd329bab9f1f33baf
Fixed in
  • f99399b48e3edd6851fac34cd329bab9f1f33baf
LinuxLinuxAffected
  • ≥ 5ac7eace2d00eab5ae0e9fdee63e38aee6001f7c, < dd3ea3fcba7c75493760cdbccd35f029597e8d5e
Fixed in
  • dd3ea3fcba7c75493760cdbccd35f029597e8d5e
LinuxLinuxAffected
  • ≥ 5ac7eace2d00eab5ae0e9fdee63e38aee6001f7c, < da0b595d8e6e2dd798f6e34e09dc51a13b888514
Fixed in
  • da0b595d8e6e2dd798f6e34e09dc51a13b888514
LinuxLinuxAffected
  • ≥ 5ac7eace2d00eab5ae0e9fdee63e38aee6001f7c, < b3e404550dc2b7f3d4bb64b1da8005a1fa9a798d
Fixed in
  • b3e404550dc2b7f3d4bb64b1da8005a1fa9a798d
LinuxLinuxAffected
  • ≥ 5ac7eace2d00eab5ae0e9fdee63e38aee6001f7c, < 24806fc9bca28fa1433bf938d1424dcb45d80e50
Fixed in
  • 24806fc9bca28fa1433bf938d1424dcb45d80e50
LinuxLinuxAffected
  • ≥ 5ac7eace2d00eab5ae0e9fdee63e38aee6001f7c, < 11516a0c402a6c1fa52254aa70d8d65fb921e59e
Fixed in
  • 11516a0c402a6c1fa52254aa70d8d65fb921e59e

Description

CVE-2026-99040 is a vulnerability in Microsoft products version 3.0 and 4.0 related to a race condition in the add_key() function with keyring restrictions. The vulnerability has been published but lacks detailed technical or impact information and no CVSS score is assigned.

References

Community reviews

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